Oil fuel burner



J. JONES OIL FUEL BURNER Oct. 4, 1932.

Filed Sept. 29. 1930 Patented Get. 4, 1932 JAMESYWILLIAM J' ONES, OF

PATENT OFFICE l IPOPLAR, LONDON, ENGLAND i OIL FUEL BURNER Application filed `September 29, 1930, Serial No rlhis invention relates to improvements in oil fuel burners o-f the type having three concentrically arranged tubular passages or ducts (including an axial or central passage) in the burner body the intermediate one of which passages is for oil fuel and the outer passage for fluid under pressure (compressed air or steam) for operating the burn-er.

The principal object vof the present invention is to provide an oil fuel burner of the type above mentioned whereby a high degree of eiiciency together with substantial economy in consumption of oil and of pressure fluid (compressed air or steam) required for operating the burner will be obtained. The burner is such as to obtain or ensure highly 'effective atomization of oil by the use of steam or air at a low pressure.

Further the burner is such that carbonization is reduced to a minimum, if not entirely avoided, this obviating the necessity -of frequently olea-ning the burner. A burner according to this invention is further such as to give a steady circular or diffused flame, and the burner comprises means whereby it can be readily adjusted to suit oils of vary# ino' viscosity, and means to regulate the quantity of pressure fluid, fuel oil and atmos` pheric air passing through the burner.

This invention consists principally in an oil fuel burner of the type having three concentrically arranged tubular ducts or passages in the burner body the intermediate one of which passages is for oil fuel and the 5 outer passage for the fluid under pressure (compressed air or steam) for operating the burner, wherein the central or innermost passage or duct is utilized for the supply of atmospheric air for the burner, and a regulating valve is provided for regulating the quantity of atmospheric air admitted to the said central passage or duct.

Further features of the invention are set forth in the appended claims and are hereinafter described with reference to the accompanying drawing which illustrates, by way of example, an oil fuel burner according to one embodiment of the invention.

1n the drawing- 485,261, and in Great Britain October 5, 1929.

Fig. 1 is a sectional elevation of the burner, and l y Fig. 2 a cross section on the line A A Fig. 1.

As shown in the drawing the body of the burner is a tubular casting having innerand outer walls and c forming an annular chamber m between them, lthe said walls being cast together at the rear end el, the front end of the body being open and screw threaded at e and e to receive the outer and innery conical nozzles or nozzle members j and which constitute the outlet nozzle of the urner.

Y The outer conical nozzle or nozzle member f has an inner conical aperture t converging from the open end -of the burner body towards the outer end of said member. and an outer diverging conical aperture 72, adjoining and extending from the outer end of the said inner conical aperture 7L to the extremity of the said outer nozzle member f, the inner conical nozzle g being, 4as shown, conical on both its inner and outer sides and converging from the open end of the burner body to the extremity or outlet endof said nozzle member g. The faces or sides of both the inner and the outer conical apertures 71, and h in the outer conical nozzle member f are at an angle of approximately 4:50 to the axis of the burner.

The burner nozzle or nozzle member f can be adjusted backwards and forwards on the screw thread e on the body of the burner so that the annular opening between the outer and inner conical nozzle members f and g can be increased or decreased so as to vary or regulate the quantity of steam or air passing from the chamber m out through the nozzle.

On the body of the burner aty its rear end are formed the tubular branches la and Z, the branch being for the admission of steam or air to the chamber fm, for operating the burner, and the branch Z for admission of oil fuel to the hereinbefore mentioned inner annular chamber or passage n.

Centrally in the burner body is the here! inbefore mentionedA axial atmospheric air duct or tube p which extends throughout the length ofthe burner body and forms the inner wall of the aforesaid inner annular oil chamber or passage a. As shown the forward or left hand end (outlet end) of the tube p is tapered or conical in form and extends through the outlet end of the inner nozzle member g. On its rear end the tube p is screw threadedat r where it is screwed into a corresponding screw thread formed in the extension w on the rear end of the. burner body, the construction and arrangement being such that the tube g? can be screwed inwardly and outwardly relatively to burner body and thus adj usted longitudinally in the body to vary the quantity voi oil fuel passingv out of the nozzle through the annular opening between the tapered or conical outlet end of the said tube p andthe outlet end of' the inner nozzle member' g. The tube 20 being thus adjustable longitudinally in the burner body vserves as controlling or regulating valve for controlling or :regulating the quantity of oil passing out through thefoutlet nozzle of the burner.

' As shown in Fig. l the left hand or outlet end portion of the axial atmospheric air duct or tube p gradually tapers oris of slightly conical form on its interior so'that the inner side of this outlet portion ofthe tube converges tothe outlet at the end of thetube which is thus of smaller diameter or'cross area than the other, or main portion of the said duct or tube.

In the embodiment illustrated@ Fig. lis the controlling valve whereby the admission of air to the axial duct or tube p can be controlled and regulated. As shown this valve D is a screw-down conical Vvalve having its seat on a conical face formed on the interior of the said tube p at the rear or inlet end thereof. Any other appropriate form or location of valve for controlling and regulan' ing admission of air to the tube p may be employed.

A hand wheel p is secured on the rear end of the tube p for adjusting same longitudinally in the burner body as hereinbefore mentioned. Also, as clearly shown in the draw ing, the hand wheel p carries rods or studs on the outer ends of which is secured Va cross member or bridge bar through which works the screwed stem of the air regulating valve o, a hand wheel for operating said valve being secured in the end of the said stem. s, Fig. l, indicates the hereinbefore mentioned right and left hand intersecting helical grooves or riflings. Y

Also as clearly shown in the dra-wing, a gland box or stufling box is provided in the rearward extension fw of the burner body to prevent leakage of oil.

The action of the burner is as follows; as-` suming it tobe operatedby steam Steam at the predetermined or appropriate pressure is admitted (from a supply pipe not shown) through the branch 7c on the burner body to the outer annular chamber m and passes out through the annular orifice between the outer nozzle member f and the inner nozzle member g and oil being at the same time supplied (from a supply pipe not shown) through the branchl to the inner annular chamber fn, is, by the action ofv the steam issuingfrom the nozzle of the burner, carried out through the annular orilice between the inner side of the inner conical nozzle member g and the tapered or conical outlet end ofthe hereinbefore mentioned axial or central atmospheric air'duct or pipe p; at the same time airadmitted to the inlet or rear end of the axial duct'or pipe p, through the valve o passes out Athrough the tapered outlet end of the said pipe g2 and impinges .on the oil which as above mentioned is ejected from the nozzle through the action of the steam admitted to and passing through Y varv the amount of steam passing out of the nozzle from the chamber fm.

As hereinbefore mentioned instead of steam being admitted to the outer annular chamber fm the burner might be operated with air at suitable pressure admitted to the said Y chamber through the branch k.

What I claim is f-` 1 l. In an oil fuel burner comprising a burner body and a burner nozzle, the combination of an annular duct-in said body for the supply of fuel oil to said nozzle, another annular duct surrounding and concentric with the oil duct for the passage of'fluid under pressure to said nozzle, an inner duct concentric with the oil and fluid pressure ductsV for the passage'of atmospheric air to the burner nozzle, right-hand and left-hand intersecting helical grooves in the bore of the atmospheric air duct, a valve at the end of the atmospheric air duct remote from thev burner nozzle for regulating the ladmission of atmospheric air to said duct, a coned inner nozzle member adjustable longitudinally of the burner, and an outer nozzle member also adjustable longitudinally of the burner and having a double conicaly face, the outer of which faces is disposed at an angle of approximately 45 to the longitudinal axis ofV the burner.

2. In an oil fuel burner comprising a burner body and a burner nozzle, the combination of an annular duct in said body for the supply of fuel oil to said nozzle, another lOl' annular duct surrounding and concentric with the oil duct for the passage of fluid under pressure to said nozzle, an inner duct concentric With the oil and fluid pressure ducts for the passage of atmospheric air to the burner nozzle, said inner duct being formed by the bore of a tube extending longitudinally in the burner body and having its end remote from the burner nozzle extending beyond the burner body, right-hand and left-hand intersecting helical grooves in the bore of said tube, a valve having its seat formed on the end of said tube remote from the burner nozzle for regulating the admission of atmospheric air to thekbore of the tube, a coned nozzle member carried by that Wall of the burner body which separates the oil and pressure fluid ducts and adjustable longitudinally of theburner, and an outernozzle member also adjustable longitudinally of the burner and having a double conical face, the outer of Which faces is disposed at an angle of approximately 45 to the longitudinal axis of the burner.

3. In an oil fuel burner comprising a burner body and a burner nozzle, the combination of an annular duct in said body for the supply of fuel oil to said nozzle, another annular duct surrounding and concentric With the oil duct for the passage of fluid under pressure to said nozzle, an inner duct concentric With the oil and fluid pressure ducts for the passage of atmospheric air to the burner nozzle, said inner duct being` formed by the bore of a tube extending longitudinally in the burner body, and having its end remote from the burner nozzle extending beyond the burner body, right-hand and left-hand intersecting helical grooves in the bore of said tube, a valve having its seat formed on the end of said tube remote from the burner nozzle for regulating the admission of atmospheric air to the bore of the tube, a coned nozzle member carried by that Wall of the burner body Which separates the oil and pressure fluid ducts and adjustable longitudinally of theburner, and an outer nozzle member also adjustable longitudinally of the burner and having a double conical face, the outer of Which faces is disposed at an angle of approximately 450 to the longitudinal axis of the burner, a conical nozzle formed on the central tube of the burner at the outlet end thereof, and means for adjusting the position of the said tube longitudinally of the burner body.

JAMES WILLIAM JONES. 

